Explanation of Code P2564: “Turbocharger Boost Control Position Sensor (TBCPS) Circuit – Short to Ground”
Severity
- Level: 🔴 High (risk of turbo overboost, damaging the engine).
- Urgency:
- Significant loss of power.
- Risk of damage to the turbocharger (high repair costs).
Common Symptoms
- 🚨 Check Engine Light on (MIL).
- 🐌 Weak or hesitant acceleration.
- 💨 Blue/black smoke from the exhaust.
- ⛽ Increased fuel consumption.
Main Causes
- Short to ground:
- TBCPS sensor wire in contact with the chassis.
- Corrosion in the connector or wiring harness.
- Faulty TBCPS sensor:
- Sensor damaged by heat/vibrations.
- PCM issues (rare):
- Signal processing error or outdated software.
Diagnostic Procedure (Detailed Steps)
Step 1: Check for TSBs (Technical Service Bulletins)
- Example: TSB 19-102 for certain VW/Audi models (TBCPS connector issues).
Step 2: Visual Inspection
- Locate the TBCPS sensor: Attached to the turbo or exhaust manifold (e.g., VW Golf 2.0 TDI).
- Check the connector: Corrosion, bent pins, exposed wires.
Step 3: Electrical Testing of the Sensor
- Multimeter:
- Power supply: 5V between the power terminal (red wire) and ground.
- Signal: 0.5-4.5V variable with the position of the boost control valve.
- If voltage is 0V → Short to ground.
Step 4: PCM Circuit Verification
- Continuity: Test the wires between the sensor and the PCM.
- Insulation resistance: No contact between the signal and ground.
Solutions & Costs
| Problem | Solution | Average Cost |
|---|---|---|
| Faulty TBCPS sensor | Replacement | €100 – €300 |
| Wiring repair | Harness/connector repair | €50 – €200 |
| PCM reprogramming | Software update | €100 – €350 |
Mistakes to Avoid
- ❌ Testing the sensor without disconnecting the battery: Risk of damaging the PCM.
- ❌ Ignoring oil leaks near the turbo: Can corrode the TBCPS connector.
Frequently Affected Models
- Volkswagen Golf/Passat (TSI/TDI engines).
- Audi A3/A4 (2.0L TFSI).
- BMW 320d (N47 engine).
Practical Case
- Problem: Code P2564 on a VW Golf VII 2.0 TDI with hesitant acceleration.
- Diagnosis: Corroded TBCPS connector (short to ground).
- Solution: Connector cleaning + sensor replacement (€180).
Pro Tips
- Use an advanced scanner: View live data (PID “Boost Pressure”) to monitor pressure in real time.
- Test under load: Reproduce the fault by driving at high RPM (3000-4000 rpm).
If the code persists after repair, consult a professional equipped with manufacturer diagnostic tools (e.g., VCDS for VW/Audi)! 🔧🚗💨